Designed for casement and roof windows, this air conditioner window seal provides a snug, energysaving seal for most standard openings in homes or offices. Compatibility and fit: adapts to casement and roof windows; suitable for standard profiles. Insulation and energy efficiency: blocks air leakage around the window unit; stabilizes indoor temperature; reduces heating and cooling costs. Durability and performance: density foam core; resistant to thermal expansion and compression; long service life. Protection and comfort: durable materials resist wear; blocks drafts, dust, and moisture; supports yearround comfort. Use scenarios Winter: seals a drafty casement window in a living room, reducing cold drafts around the AC unit. Summer: minimizes heat gain around a roof window or skylight in an office or attic space. Rentals or shared spaces: quick, nonpermanent seal to improve energy efficiency without remodeling.